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The properties of a surface are differen...

The properties of a surface are different from those of the bulk liquid because the surface molecules

A

are smaller than other molecules

B

acquire charge due to collision from air molecules

C

find different types of molecules in their range of influence

D

feel a net force in one direction

Text Solution

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The correct Answer is:
C, D
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Knowledge Check

  • For a surface molecule

    A
    the net force on it is non zero
    B
    the net force on it zero
    C
    there is net downward force
    D
    there is net upward force

  • Molecular forces exist between the molecules of a liquid in a container. The molecules on the surface have unequal force leading to a tension on the surface. If this is not compensated by a force, the equilibrium of the liquid will be difficult task. This leads to an excess pressure on the surface. The nature of the meniscus can inform us of the direction of the excess pressure. The angle of contact of the liquid decided by the forces between the molecules, air and container can make the angle of contact. The direction of the excess pressure in the meniscus of a liquid of angle of contact ( 2pi )/(3) is

    A
    upward
    B
    downward
    C
    horizontal
    D
    cannot be determined

  • On heating a liquid, its surface tension

    A
    Increases
    B
    Decreases
    C
    Remains same
    D
    Is reduced to zero

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